Disregard the circled answers as I dont know if its write please answer ALL (D)
ID: 1714357 • Letter: D
Question
Disregard the circled answers as I dont know if its write please answer ALL
(D) 30-40 The concentration of all types of organic materiale wat (The Onygen-depleting capacity of water KA) The concentration of organic material dredd efni (e. mewn *In our laboratory, dissolved oxygen was measured using polarographic decodicals percobsThe components of the sensors are the oxygen pemeable membrane, the working electrode, de electrolyte ution de of the one used in our lab) a reference electrode. The optional principle of this probe is based on auris A the voltage applied between the gold cathode and the silvermede (B) the current produced when dissolved om ossing the membrane is reduced on the surface of gold cathode (o the voltage produced when dissolved Rygen crossing theme is reduced on the gold cathode (D) the current produced when dissolved oxygen crossing the membrane is adired on the surface of the silver cathode 19) in polarographie electrochemical dissolved oxygen sensors, the approach flow to the senior membrane must be continuous for OXYgen measurements to be correct. The diffusion of the oxygen molecules in the sensor head creates an eyen poor one simulates a reduced concentration of oxygen. The concentration as the membrane must always be the equal to the concentration in the remainder of the sample. This condition can be met by (A) periodically replacing the sensor membrane. (B) measuring the dissolved oxygen at a very precise temperature. (C) stirring the sample at the appropriate rate until a steady flow of oxygen is detected at the membrane interface. Ce calibrating the sensor membrane at the beginning of every measurement 20) Activated carbon is carbon produced from any carbonaceous source material. Some of the most common sources include coal, petroleum pitch, bamboo, coconut husk, wood, and even a variety of agricultural wastes. The source material is subject to an activation process to render a useful product. One of the two forms of activation processes consists of (A) burming the material at 2300 F. (B) carbonizing the material in the absence of oxygen and then subjecting it to a very high temperature steam. (C) crushing the material to yield a granular or pulverized product, then burning in an 2300 °F. (D) subjecting the material to steam at 2300 F. 21) Experimental laboratory data obtained by using a gravity-fed carbon bed configuration provided evidence that the effectiveness of the tested activated carbon for the removal of methyl orange is directly associated to the __of the granular carbon. (A) particle size range 8) surface area per unit mass (C) bulk density (D) porosity 22) Experimental laboratory data provided evidence that an important factor controlling the efficiency of filtration of the gravity fed carbon bed configuration for the removal of methyl orange at the concentration tested is the of the granular carbon (A) particle size range B surface area per unit mass (C) bulk density (D) porosityExplanation / Answer
16) option B
17) option D
18) option D
19) option D
20) option D
21) option D
22) option B